BA sizes

[Nicholas FarrParticipant @nicholasfarr14254]

Posted by Howard Lewis on 14/05/2021 22:54:42:

The tables above have been most usefull

Opened up a new box of Sherwood M5btaps, today, to find that they don't want to go into a 4.2 mm hole. Why? 5.25 mm diameter although marked 5 x 0.8! So look like being incorrectly marked 1BA!

Howard

Hi Howard, maybe they are 5mm taps for thread repair coils.

Regards Nick.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi MC, the chart is a page from Tubal Cain's Model Engineer's Handbook.

Regards Nick.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Dr. MC Black on 15/05/2021 00:46:43:

Posted by Michael Gilligan on 12/05/2021 17:42:38:

Posted by Nigel Graham 2 on 12/05/2021 15:38:51:

What typo?

.

[…]

MichaelG.

.

May I ask the source of this data please?

It would be useful to have a laminated copy in my shed-workshop but I don't know how to print just the table.

Very many thanks in anticipation

MC

 

.

Yes of course … it is the page which Nigel Graham 2 misquoted

… Please see Nigel’s post on page 2 of this thread … which you have already questioned, and upon which I have already remarked.

MichaelG.

.

https://www.waterstones.com/book/model-engineers-handbook/tubal-cain/9781854861344

Edited By Michael Gilligan on 15/05/2021 08:32:44

[Dr. MC BlackParticipant @dr-mcblack73214]

Posted by Michael Gilligan on 15/05/2021 08:19:11:

May I ask the source of this data please?

It would be useful to have a laminated copy in my shed-workshop but I don't know how to print just the table.

Very many thanks in anticipation

MC

.

Yes of course … it is the page which Nigel Graham 2 misquoted

… Please see Nigel’s post on page 2 of this thread … which you have already questioned, and upon which I have already remarked.

MichaelG.

.

**LINK**

Edited By Michael Gilligan on 15/05/2021 08:32:44

Thank you for taking the time to respond.

I did NOT appreciate that the table came from Tubal Cain's book – I'll have to buy a copy.

With best wishes and thanks again.

MC

[Dr. MC BlackParticipant @dr-mcblack73214]

Posted by Nicholas Farr on 15/05/2021 08:04:10:

Hi MC, the chart is a page from Tubal Cain's Model Engineer's Handbook.

Regards Nick.

Very many thanks for your prompt, helpful and courteous response.

MC

[Nigel Graham 2Participant @nigelgraham2]

Michael –

Oh there! Still took me a couple of readings to spot it.

Thank youl!

~'Twas all those 4s preceding it. I was always better at Reading & 'Riting than 'Rithmetic but combining them, well…..

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Dr. MC Black on 15/05/2021 09:32:24:

[…]

I did NOT appreciate that the table came from Tubal Cain's book – I'll have to buy a copy.

…

.

Sorry, I did not specifically state that

I did, however, include the page number in the image … largely for Nigel’s benefit.

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Nigel Graham 2 on 15/05/2021 09:50:08:

Michael –

Oh there! Still took me a couple of readings to spot it.

Thank youl!

~'Twas all those 4s preceding it. I was always better at Reading & 'Riting than 'Rithmetic but combining them, well…..

.

All’s well that ends well

Proof reading one’s own text is often difficult

MichaelG.

[Howard LewisParticipant @howardlewis46836]

Don't think that I have any BA thread gauges, (Typical! Whit, Unified and Metric but no BA&nbsp but will tap a nut 1 BA and try the Taps. They certainly don't want to go into a M5 nut!

1 BA is 0.9 mm pitch while M5 Coarse is 0.8, so difference in both diameter and pitch!

An order for new Taps is imminent. Hand, Spiral Point, or Spiral Flute? is now the decision

Howard

[Dr. MC BlackParticipant @dr-mcblack73214]

Proof reading one’s own text is often difficult

MichaelG.

As the former publisher for the University of London, I can safely write that proofreading one's own text is more than difficult.

One sees what one intended to write rather than what's on the paper

With best wishes and thanks again.

MC

[Dr. MC BlackParticipant @dr-mcblack73214]

Posted by Howard Lewis on 15/05/2021 12:02:44:

Don't think that I have any BA thread gauges, (Typical! Whit, Unified and Metric but no BA but will tap a nut 1 BA and try the Taps. They certainly don't want to go into a M5 nut!

1 BA is 0.9 mm pitch while M5 Coarse is 0.8, so difference in both diameter and pitch!

An order for new Taps is imminent. Hand, Spiral Point, or Spiral Flute? is now the decision

Howard

Did you try comparing the Tap with an existing 1BA screw?

I recently bought a BA thread gauge on E.Bay for less than a fiver – I guess most of that was postage!

MC

[Dr. MC BlackParticipant @dr-mcblack73214]

Posted by Howard Lewis on 15/05/2021 12:02:44:

Hand, Spiral Point, or Spiral Flute? is now the decision

Howard

Perhaps you should think about whether you want to include Serial Taps with Hand, Spiral Point and Spiral Flute?

I bought a set of M5 (or M6 – sorry forgot) serial taps in a "sale – reduced" and one of the set crumbled the first time that I used it! The supplier didn't want to know!

MC

[Former MemberParticipant @formermember12892]

[This posting has been removed]

[Dr. MC BlackParticipant @dr-mcblack73214]

Posted by br on 15/05/2021 13:57:51:

A final bit on nut spinners as per original post

Nut spinners are used in the aircraft industry on terminal blocks on wiring looms

This is the vertical stud type with insulated seperators

So on a connection strip, loom terminals placed over stud, nyloc nut fitted and tightened with a nut spinner, until the nut spinner CLICKS

This is the preset torque arrangement in the handle to prevent over tightening.and putting stress into the stud.

Hope that makes sense.

bill

That makes perfect sense.

Your spinner sounds a bit like a Torque Wrench

The Nut Spinners that I bought do NOT click in that way.

I still have an eye open for a 4BA or 1/4" Nut Spinner!

With best wishes and thanks again.

MC

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